c# 64 bit c++ dll import problem

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DLL

Hi guys,
I have a 64 bit processor machine and I could import 32 bit dll but I wouldnt do the sama at 64-bit dll? Why ?

Posted 10-Dec-12 4:20am

sarngon

Updated 9-Dec-18 20:38pm

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Albert Holguin 10-Dec-12 10:39am

Your question isn't making sense, can you elaborate what you're talking about?

Sergey Alexandrovich Kryukov 10-Dec-12 16:39pm

Logically, if something worked out for 64-bit DLL (what instruction-set architecture, by the way? there are at least two of 64-bit), it means that the .NET assembly was also 64-bit, otherwise it would not work. The target CPU of this assembly should be changed. -- please see my answer and my comment below.
--SA

ZurdoDev 10-Dec-12 10:50am

Is there an error?

Sergey Alexandrovich Kryukov 10-Dec-12 16:40pm

Unfortunately, the mistakes like OP's produce not very comprehensible messages. I know what it is -- please see my comment above and my answer.
--SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-12-10T10:37:00

Solution 1

The target CPU for C# .NET P/Invoke should match the DLL target CPU.

If you want to import 64-bit DLL, you should set one of 64-bit targets for the target CPU in your .NET project options. CPU instruction-set architectures never ever can be mixed in the same process.

[EDIT]

Thanks to Matt T Heffron for the correction.

—SA

Posted 10-Dec-12 10:37am

Sergey Alexandrovich Kryukov

Updated 10-Dec-12 17:25pm

v3

Comments

Matt T Heffron 10-Dec-12 19:12pm

OP said that 32 bit import worked, but 64 bit didn't.
I think the target CPU in the project options need to be set to "x64" (or "Itanium" as appropriate).

Sergey Alexandrovich Kryukov 10-Dec-12 23:23pm

Thank you for the correction. Whatever it is, the target instruction-set architectures should match.
--SA

Sergey Alexandrovich Kryukov 10-Dec-12 23:26pm

Text modified, your correction credited. Thank you again.
--SA